Planet driving-gear.



Patented Apr. 3, 1917.

1 y r 11: 1 M o IFHGJE.

Inventor CHRL. 7%057 WWW.

flitomey.

ll ll be revolved bodily about JA. AETIEHGESELLSCHAFT, 03E DUISBULft-Gr, GlF'irtli'fAhhl'Y,

PLANET DElIVENGl-GEAR.

@riginal application filed lhccemher 23, 1912, Serial No. 738,237.

comparatively small floor space is available.

The constructions hitherto in general use employ the diiferential action for this purpose, in that by the planet drive the difference between the peripheral speeds of two gear wheels rotating at the same angular speed but varying from one another in the pitch-circle diameter s transferred to the shaft which is to be reduced in speed. Such driving gear, however, has a very small eih ciency. lhis disadvantage is obviated according to the present invention by the high change being obtained not by differential action but merely by the ratio of the number of teeth of the gear wheels in engagement.

The invention is illustrated by way of err-- ample in the accompanying drawings, in which Figure 1 shows a longitudinal section through the driving gear and Fig. 2 the side elevation with the pitch lines shown dotted. Referring to the drawin s, f designates the low speed shaft anda the high speed shaft, the former being shown rigidly connec'ted to an inclosing shell for the mechanism, and which shell is provided With two internally toothed rimse and it respectively. intermediate gearing, including planet wheels, is provided. between these two rims and the fast running shaft a in such a manner that a high velocity ratio is obtained between the two said shafts f and a. This is effected by providing a planet gear connection between the rim and the shaft a, rotat= ing said planet. gear from the internally toothedrim c, and effecting a revolution of the planet gear about the 0;. To this end a planet gear wheel, or preferably planet gear wheels, a? are arranged to engage the internally toothed rim 6 and through a gear wheel, or preferal y wheels, 0 attached to the wheel at, to rotate or be rotated by a pinion b which is fixedly secured to the shaft a. The gear nah els d c are adapted to aft a as an axis through. the medium Specification of Letters Patent.

a carrying Patented Apr. will Divided and this application filed .1 uly 17,

Serial No. 851,569.

frame 9, rotatably mounted upon the shaft a, and upon which frame the said wheels (3 and 0 are rotatably mounted. Rotation of the frame 9 is effected from the internally toothed rim 7% through an intermediate gear wheel, or preferably gear wheels, i which engage a gear wheel 1 rotatably mounted on the shaft a and fixedly secured to the carry ing frame g. The operation is as follows Assuming, for simplicity, that power is applied to the shaft j, which is given one revolution counter-clockwise, and that the wheels have the following number of teeth and velocity ratios:

One counter-clockwise rotation of rim it will then effect -l ll} or 7 revolutions of h and 9'.

At the same time d has made l or 28 revolutions counter-clockwise. Z5 makes I) X ti X "g or l lfi revolutions, in the clockwise direction.

In general ternally toothed rims connected with the low speed shaft; a planet gear connection between one of said rims and the high speed shaft; and means driven from the other of said rims to revolve said planet gear connection about the high speed shaft.

2. Planet driving gear, comprising: a low speed shaft, and a high speed shaft; two internally toothed rims connected with said low speed shaft; a planet gear engaging one of said rims; gear wheel rotatable with wil said high speed shaft, and a gear wheel engaging the same and rotatable with said planet gear wheel; and means to revolve said planet gear wheel about said high speed 5 shaft, and consisting of a gear Wheel mounted to rotate about a fixed axis, and engaging the other of said rims, a gear wheel rotatably mounted upon said high speed shaft and engaging the said rim-engaging gear Wheel, 10 and a frame driven by said gear wheel 'rotatable upon the high speed shaft and upon which frame are rotatably mounted said planet gear Wheel and the gear Wheel driven thereby.

CARL TADEY. [1,. 8.

' Witnesses:

ALBERT N'UFER, FRANCES NUFER. 

